Air Traffic Coordinator: Coordinates movement of air traffic between altitude sectors and control centers to provide maximum separation and safety for aircraft: Maintains radio and telephone contact with AIR-TRAFFIC COORDINATORS (government industry) in adjoining control centers. Relays information regarding air traffic by radio to AIR-TRAFFIC-CONTROL SPECIALIST, TOWER (government industry) and AIR-TRAFFIC- CONTROL SPECIALIST, STATION (government industry), monitoring each sector, for transmittal to AIRPLANE PILOT, COMMERCIAL (air industry). Relays information, for example altitude, expected time of arrival, and course. Determines procedure and time for altitude changes to prevent collisions and excessive traffic buildup in flight sector. Completes daily activity report.